actually according to the ye ol wiki, we already celebrate solstice (or Yule).

Yule or Yule-tide is a winter festival that was initially celebrated by the historical Germanic peoples as a pagan religious festival, though it was later absorbed into, and equated with, the Christian festival of Christmas. The festival was originally celebrated from late December to early January on a date determined by the lunar Germanic calendar. The festival was placed on December 25 when the Christian (Julian) calendar was adopted. Some historians claim that the celebration is connected to the Wild Hunt or was influenced by Saturnalia, the Roman winter festival.

You gotta love how the old pagan holidays are still celebrated by just about everyone, whether they know it or not. Furthermore Yule is totally metal.